Siemens SIMATIC Manual page 343

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Table of Contents

Wiring: Resistance measurement with 2-, 3- and 4-wire connection

The following connection possibilities also apply to silicon temperature sensors and PTCs.

It is not necessary to interconnect the M- terminals when measuring using resistors,

resistance thermometers, PTCs, or silicon temperature sensors. However, interconnection of

the M- terminals may enhance interference immunity.

S7-300 Module data

Manual, 06/2017, A5E00105505-AJ

6.6 Analog input module SM 331; AI 8 x 13 Bit; (6ES7331-1KF02-0AB0)

2-wire connection. Insert a bridge between M and S (no line resistance compensation).

3-wire connection

4-wire connection. The fourth line may not be wired (remains unused)

4-wire connection. The fourth line is routed to the terminal strip in the cabinet but is not wired.

Internal supply

+ 5 V from backplane bus

Logic and backplane bus interface

Electrical isolation

Analog to Digital Converter (ADC)

Current source

Block diagram and terminal diagram

Analog modules

S7-300S7-300 module data